If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

To log in and use all the features of Khan Academy, please enable JavaScript in your browser.

0 energy points

Chassis modifications

This video shows how Bit-zee's shell was modified to allow space for the bumper switches. Created by Karl Wendt.